Display; Functional Description; Stepping Motor Operation - Sutter Instrument LAMBDA 10-B Operation Manual

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the key will read normally. Keys pressed and released while a move is in progress are
ignored.

1.6.3.2 Display

When the controller is switched (powered) on, the controller homes all the attached filter
wheels and activate all the attached shutters. During this initialization process, the following
is displayed on the controller's display.
After the copyright screen, the unit display should be similar to:
The first line of the status screen indicates what the filter wheel sizes are, and the position
and speed setting of each. At the end of the first line is a character which indicates
online/offline status of the controller (online is indicated by "U" if the USB interface is in
control or "S" for the serial interface. "L" indicates local (offline) mode, allowing for keypad
control).
The second line of the status screen shows the opened/closed state of the two possible
shutters that can be attached to the controller. When an attached shutter is a SmartShutter,
its mode is also shown.
See the next chapter for a detailed description of how to control the controller locally via the
keypad and how to navigate through the various menus shown on the controller's front-panel
display.

1.7 Functional Description

1.7.1 Stepping Motor Operation

Stepping motors are not as familiar to most people as the common DC motor, but there are
some similarities. The DC motor consists of an armature, an electromagnet mounted on a
rotating shaft, which is located inside a permanent magnet. Current is supplied to the
electromagnet through brushes that rub on contacts on the armature. When the
electromagnet is energized, the armature rotates to align the poles of the electromagnet with
the opposite poles of the permanent magnet. Of course, before this can occur, the rotation of
the armature changes the contact plates rubbing on the brushes so that the current is
reversed. This causes the poles of the electromagnet to reverse, establishing a force for
continued rotation. This switching action is called commutation.
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